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The Best Episodes of It's Always Sunny in Philadelphia Season 18

Every episode of It's Always Sunny in Philadelphia Season 18 ranked from best to worst. Discover the Best Episodes of It's Always Sunny in Philadelphia Season 18!

Binge this in 2h 18m•Peaking at 8.3/10

Four egocentric friends run a neighborhood Irish pub in Philadelphia and try to find their way through the adult world of work and relationships. Unfortunately, their warped views and precarious judgments often lead them to

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Episode Rankings

  1. #1 Fan Favorite
    It's Always Sunny in Philadelphia Season 18 Episode 1 - Frank Marries a Corpse
    7.9/10(1224 votes)

    #1 - Frank Marries a Corpse

    S18:E1

    The guys help Frank with his cold feet ahead of his wedding to Sam. Dee tries to scare Sam off the nuptials with testimonies from The Waitress, Artemis, and Snail.

    Director:Todd Biermann
    Writer:Charlie Day

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  2. It's Always Sunny in Philadelphia Season 18 Episode 2 - Dennis and Dee Don't Get Rich
    8.0/10(1122 votes)

    #2 - Dennis and Dee Don't Get Rich

    S18:E2

    The Reynolds twins push themselves to the limit to secure Sam's transfer of wealth. Charlie and Frank plan a proper memorial for Bonnie during the annual Mummers Parade.

    Director:Todd Biermann
    Writer:Charlie Day

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  3. It's Always Sunny in Philadelphia Season 18 Episode 3 - The Gang Gets Tested
    8.1/10(1024 votes)

    #3 - The Gang Gets Tested

    S18:E3

    Dennis and Dee are diagnosed with ADHD, and even more shocking: Mac isn't. They go back to school for a do-over now that they understand their brains more better.

    Director:Richie Keen
    Writer:Charlie Day

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  4. It's Always Sunny in Philadelphia Season 18 Episode 4 - 2026: A Virtual Insanity
    7.4/10(926 votes)

    #4 - 2026: A Virtual Insanity

    S18:E4

    The Gang's RV breaks down en route to a Jamiroquai concert, leaving them to fend for themselves in a dangerous wasteland of junkies and street people.

    Director:Heath Cullens
    Writers:Rob Rosell, Vanessa McGee

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  5. It's Always Sunny in Philadelphia Season 18 Episode 5 - The Gang Goes to the Ren Faire
    8.3/10(884 votes)

    #5 - The Gang Goes to the Ren Faire

    S18:E5

    Mac, Dennis, and Dee strive to conquest their way onto the Quilt of Legends at the local Renaissance Faire. Charlie discovers a love of luting while Frank tries to acquire the faire from old foes.

    Director:Richie Keen
    Writers:Rob Rosell, Dave Chernin, John Chernin

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  6. It's Always Sunny in Philadelphia Season 18 Episode 6 - The War on Alcohol
    8.1/10(674 votes)

    #6 - The War on Alcohol

    S18:E6

    The Gang takes the trend against drinking into their own hands. Dennis, Dee, and Frank look to recruit white collar suits for happy hour while Mac and Charlie seek to enlist blue collar factory workers so they can return the bar to the melting pot it once was.

    Directors:Dave Chernin, John Chernin
    Writers:Dave Chernin, John Chernin

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  7. It's Always Sunny in Philadelphia Season 18 Episode 7 - Gilligan's Island: A Conspiracy Theorist's Paradise
    6.7/10(571 votes)

    #7 - Gilligan's Island: A Conspiracy Theorist's Paradise

    S18:E7

    Mac and Charlie drink the proverbial Kool-Aid while trying to uncover the mystery of why 'Gilligan's Island' never made it to 100 episodes.

    Director:Heath Cullens
    Writers:David Hornsby, Biniam Bizuneh

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  8. It's Always Sunny in Philadelphia Season 18 Episode 8 - Mac and Dennis Tear Their ACLs
    6.0/10(3 votes)

    #8 - Mac and Dennis Tear Their ACLs

    S18:E8

    After a Christmas card catastrophe, Charlie nurses a bedridden Mac and Dennis and deliberates on which one is the originator of all their ideas. Dee and Frank are tired of being the bottom of the communication ladder and decide to flip the script.

    Director:Heath Cullens
    Writer:David Hornsby

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Season 18 Ratings Summary

"Frank Marries a Corpse" is the best rated episode of "It's Always Sunny in Philadelphia" season 18. It scored 7.9/10 based on 1224 votes. Directed by Todd Biermann and written by Charlie Day, it aired on 8/17/2026. This episode is rated 0.1 points higher than the second-best, "Dennis and Dee Don't Get Rich".